looking at the deflected shape, it seems some parts were in tension. I'm guessing if it's an old church it is made of stone? How did you account for zero tensile capacity of stone in the model?
You could not do that in linear analysis. Later it was decided to analyse with other nonlinear analysis packages like Abaqus. Robot Milennium was used to check its possibilities for such modelling. Unfortunately, no valuable results were used from Robot in the project.